Pressure-indicator.



W. -W. BRISSENDN.

PRESSURE INDICATOR.

MPL10-T1011 Hmm MAY 17, 19o?A Patented Mar. 23, 1909.

UNTTED' STATES PATENT cFFroE.

WALTER W. BRISSENDEN,l OF CHICAGO, ILLINOIS, ASSICNOR TO NATIONALSTEAMSPECIALTX COMPANY, 0F CHICAGO,v ILLINOIS, A CORPORATION ILLINOIS.

j.To whontlit 'may Vconce-1in'. l Y

` PRESSURE-migreren.

. ispeaiaeatron pf Letten Patent.

Patented March 23, 1909.

Application iled Hay l?, 1.907. SerialNo. 374,292.

Be itknown that I,`WALTER W. BRrssEN- DEN, a citizen of the UnitedStates of America, and resident of Chicago, Illinois, have inventedafcert'ain new and useful Improvement-in Pressure-Indicators, of whichthe following is? a specification.

f Mylnventlon relates to ressureindicators. It'relates moreparticullarly to pressure indicatorsinwhich hollow springs are employed`for operating the indicating mechanism.

Prior 'to my invention, these hollow springs have been subject to thepressure at all times, unless some sort of a ,cut-oil valve was providedat the back of'the indicator, which is ordinarily inconvenient andundesirable. In any event, with the spring always subject to pressure,it is obviousthat thetension of the will soon become weakened or imandconsequently the true pressure will not be indicated. With my improvedconstruction, however, the indicator is adapted to be-'screwed directlyinto the `tank o'r receptacle, or into a pipe-or other coupling, andmeans were provi ed inside of' the indicator for cutting ofi thepressure rom the hollow s ring',at the same time venting'the latter to te atmosphere. In this way, the indicator V v times, e pressure can becut ofLfrorn the '1nand its cut-0H vvalve are of a unita and compactform, and can beireadily attached l, nk. or other source of pressure inthe and usual manner'. At differentdic`ator, and when this is done the"interior of the hollow spring is vented to the atmos l phere, and thusthe spring is permitted to relax itstension -and rnov'e the indicating 4mechanism to ,normal condition, orthe' zero be cut oi again, andthusconsiderable'wearf marken the dial. l 5

When itis desired to ascertain the pressure, a key can be inserted inthe face ofthe indi-f cator, so as to o en communication between thepressure an the spring, andhlle Same time close the vent.

After the pressre'hs been observed or determined, 1t' canfthen mechanismadapted to be usedforalonger:

time withut injury or deterioration.' Tg the foregoing and otherusefu1., en myffgnvention conslstsin matters hereinafter setforilh andclaimed. d y' arme accompanying rawing lre -1v shows the face of theindicator: .wit :the

. ,ftheent passage around -t shutter open to expose the dial thereof.l

' Fig. 2 shows the vmechanism .with the dial removed. Fi 3 is across-sectionon the line 3-3 of ig. 1. Fig. 4 is an enlar ed sectionalview of the combined cut-.0H va ve and vent for the hollow spring.

As thus illustrated, my im roved ressure indicator com risesa casingprovi ed with a dial B an rotatable 'jshutter C. shutter can' beoperated by the central handle or loop portion c, so that the dial canbe covered when not in use. Within the interior of said casing there isa curved hollow s ring 'D having the inlet end thereof `oine to the boss.or solid portion d. This oss or solid. portion has an inlet opening dcommunicatingI with an inlet passage d2, which latter has av valve-seatcia at its upper end. A screw-threaded valve d* has its lower endadapted to engage the said valveseat to close 'communication between thepassage ds and the interior of the hollow (sipring. The cap d has an uper valve-seat s, which latter 1s adapted to e engaged by the beveledfiange di carried `by the said screw-threaded valve. The upper endportion ds of the said screw-threaded valve is Said squared,I andadapted to receive a key, such as the key E shown in dotted lines inFig. 3. When the valve is down, as shown in Fig.- 4, communicationbetween the interior of the hollow spring and the source of pressure is`cut oii, and a leakage provided from the' interior of the spring pastthe threads d of the said valve, thus venting the .interior of thespring to the atmosphere. When the valve is opened, so that the ange 17engages the seat d?, then communication is established between thesource of communication and the interior of the s ring, and the ventpassage is closed. In, t is way, `the indi- 'rcator and itseut-off valveare combined in a structureand the device as a whole' bosserthreaded-particuli* adapted screwed intol a 1tari'l'r-fo'r pipe or otherL. frv ress'ure/ is desired to e,..pressure 4the valve d' can be Itifirned,soilasgjto move' it upwardl thusl pressure into the s ring an'closing l e screw threads and- :npwar ly throughthe calp d. Afterascertaining .the pressure, the v ve can then be closed, land in sodoing, pressure is not only cut oiffrom the spring, but the contentsofthe springthat is to'say, the as under pressure in the springis ven tothe ing mechanism to normal condition.

my invention.

the pressure from said lspring and vent the" atmosphere. This permitsthe spring to relax its tension, an

to return the indicat- It Will be readily vunderstood that the pointer Gcan be operated by thesaid spring through the medium of any suitableconnection, such, for example, as the rack g and pinion g1, said rackbeing operated by an arm g2 connected with the free end of said spring.Any other suitable, indicating arrangement can be einployed withoutdeparting from the spirit of I claim:

1. Ina pressure indicator, a casing, a hol-l loW spring, and a valvelocated Within. said casing and adaptedwhen closed to out off interior'of the latter to the atmosphere, said valve provided with a turningportion disposed on the front or face of the indi'- cator.

2. In a pressure indicator, a casing, a holloW s ring, a dial, aValveextending through' the 'al and seated Within said casing andadapted to cut ofi lthe Y pressure from said` spring, said valveprovided with a pol gonal end portion dis osed on the front or i, theindicator, ad) or other instrument. v

3. In a pressure indicator, a casing containing a hollo'w s ring, 'athreaded attaching boss on the bac of said casing, indicating -mechanismoperated by said spring; a dial,

and a valve inserted through said dial and seated Within the said casingand controlling the communication between the source of pressure and thehollow spring, said valve provided with a turning portion disposed onthe front or face of the indicator.

4. In a pressure indicator, a casing, a holtending frorn t .cator,adapted to be engaged by a key or ace of- 'other instrument.

apted to be engaged by a key p -loW s ring,ia`threaded valve having oneportion or cutting off communication between the source vof pressure andthe interiorl of said s "ng, angd another portion for closmg a` lea ageor Venting passage around the threads thereof whereby the-closing of thevalve-cuts dif the pressure and vents the interior of the spring to theatmosphere, both spring and valve being seated vwithin said casing.

5. A pressure Iindicator provided with a dial, arotatable shutteradapted to be rotated to expose the dial, a hollows ring be -neath thedial, and a valve inserte through the-dial and controlling thecommunication between the source of pressure and the interior 'ofthe'hollows ring. -6.'A pressure in' cator comprising a casing-providedwith a threaded boss at the back thereof, a dial yat the front thereof,a shutterlfor covering the'dial, and a pressure controlli' valve,inserted through the dial and seate within said casing, said valveprovided lWith a' polygonal outer portion exe front' or face of. theindi-

